Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ed7bf4accda6b6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 20:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75335d186841cc7e8bac254f839a2f25 SHA-1: 8de27bb95cb4ba5250c5cb516df94ef374aab933 SHA-256: 30ed7bf4accda6b6518fcf05acf8ede6670614de4aa30aef8ca28a3842c62228
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external PDFs hosted on various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the document is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://thaisomboonautopart.com/userfiles/files/vopumabularenoje.pdf In PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/81852259963.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/81284097910.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/wizefajeteduzone.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/78860390652.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/bijonuzabijot.pdfIn PDF document text
    • http://c-amc.com/upload/files/16639384126.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/12326407385.pdfIn PDF document text
    • http://unsersohn.com/images/file/vaxasidaju.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/86289970298.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/3446702533.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/duralapidiges.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/95832073422.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/3841899956.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/ruzobuwab.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/41810617120.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/28568380513.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210914_1225388FDC00A128.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/33950953819.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/kulibobuwufepawexanifezub.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/wokupuvepivavefe.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-6/20210906135830556342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=buy+unlocked+smartphones+canadaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA5 18656 bytes
SHA-256: 18e55c89ba1266ce724ef7243fa5a41f75ce72f03f69c0f2ea8f6a7516744ff4
font_01_sfnt_off0000eaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 11044 bytes
SHA-256: d7af36abcb5f60e14e737290d30fb06e942a384e221d8791cbec750092d278f3
font_02_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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